Battery equalizing circuit
Active Publication Date: 2014-11-20
GUANGDONG CELLWISE MICROELECTRONICS CO LTD
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
The present patent provides a new battery equalizing circuit that solves the problem of previous circuits where the equalizing current was too high, causing damage to components. The new circuit uses a feedback control system to automatically adjust the duty ratio of the control signal to keep the equalizing current constant. This results in an improved equalizing effect for the whole battery equalizing circuit and reduces the risk of damage to components. The technical effect of this new circuit is to overcome the shortcomings of previous battery equalizing circuits.
Problems solved by technology
Because of differences among the individual battery units in terms of the charging status, the impedance, the temperature characteristics or the like, an imbalance among the individual battery units may arise.
Such an imbalance will lead to a reduced capacity and a shortened service life of the overall battery pack.
However, the equalizing current is liable to influences from many factors such as temperature changes, changes in voltage levels of the battery units, differences among individual devices, the line resistances and so on.
Therefore, the equalizing current may vary greatly even if the duty ratios of the PWM signals remain unchanged, which makes the equalizing effect of the whole circuit unsatisfactory.
Furthermore, the equalizing current in the prior art battery equalizing circuit 100 may exceed ratings of devices in some cases to cause risks.
Method used
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[0026]In order to further describe the technical solutions adopted to achieve the objectives of the present disclosure and the efficacies thereof, implementations, methods, steps, structures, features and efficacies of the battery equalizing circuit according to the present disclosure will be detailed hereinbelow with reference to the attached drawings and preferred embodiments thereof. The aforesaid and other technical disclosures, features and efficacies of the present disclosure will become apparent from the following detailed description of the preferred embodiments that is made with reference to the attached drawings. The technical solutions and the efficacies thereof will be better understood by those of ordinary skill in the art upon reviewing the following description. However, the attached drawings are only provided for illustration purpose but not to limit the present disclosure.
[0027]FIG. 2 is a schematic view of a battery equalizing circuit according to a preferred embod...
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The present disclosure discloses a battery equalizing circuit, which comprises a first battery unit, a second battery unit, a current detecting resistor, an equalizing inductor, a first control switch, a second control switch and a feedback control circuit. The first battery unit is connected in series with the second battery unit. The first battery unit, the current detecting resistor, the equalizing inductor and the first control switch are electrically connected with each other to form a first circuit loop. The second battery unit, the current detecting resistor, the equalizing inductor and the second control switch are electrically connected with each other to form a second circuit loop. The feedback control circuit is connected in parallel with the current detecting resistor to detect a voltage drop across the current detecting resistor, and switch between the first and the second circuit loop so as to make an equalizing current substantially constant.
Description
FIELD OF THE INVENTION[0001]The present disclosure generally relates to the technical field of battery management, and more particularly, to a battery equalizing circuit for use in a battery management system.BACKGROUND OF THE INVENTION[0002]Currently, a battery pack generally comprises a number of battery units connected in series. Because of differences among the individual battery units in terms of the charging status, the impedance, the temperature characteristics or the like, an imbalance among the individual battery units may arise. Such an imbalance will lead to a reduced capacity and a shortened service life of the overall battery pack. Therefore, it is necessary to use a battery equalizing circuit in the battery pack to compensate for the imbalance so as to maintain the capacity and prolong the service life of the battery pack.[0003]FIG. 1 is a schematic view of a prior art battery equalizing circuit. As shown in FIG. 1, the prior art battery equalizing circuit 100 is an ac...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H02J7/00
CPCH02J7/0014H02J7/0052H02J7/007H02J7/0019H02J7/0016B60L58/22H02J2207/20H02J7/00714Y02T10/70Y02E60/10H01M2010/4271G01R31/396H02J7/00
Inventor ZHAO, JIANHUA
Owner GUANGDONG CELLWISE MICROELECTRONICS CO LTD